OK I bought my first 37mm launcher the other day and now have the bug . I intend on getting it registered as a aow or DD , but ill get to that in a bit . Im going to be investing in a lathe soon for work purposes but I also intend on making some adapters for the 37 and my other shotties . Questions 1 : What tool is needed for rifling ? Will an adapter for a , say 223 with rifling in a 37mm make it a sbr ? 2: What tool would i need for boring the chamber ? is it like a tapered drill bit ? I have a few here now from dina arms for a 12ga to 9mm , 12ga to 22 . I have the 26mm adapter already , i took one of my smoker rounds that had been shot and drilled out the primer end to fit the 12ga adapters i have . Im not worried about anything exploding , there is plenty of material there by the time you put all the adapters in . It works by the way , i fired both 9mm and .22 out of it this after noon . I also fired a 12ga mini out of it but nothing more than a mess of of unburned powder and whimpy pop . I know nothing will really be accurate firing out of it but with enough adapters around you can shoot most any round . Good thing to have when there is zombies out there and ammo may be scarce .